{"id":311619,"date":"2024-05-20T22:19:18","date_gmt":"2024-05-20T14:19:18","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/311619.html"},"modified":"2024-05-20T22:19:30","modified_gmt":"2024-05-20T14:19:30","slug":"javascript-%e4%b8%ad%e6%80%8e%e4%b9%88%e5%88%a9%e7%94%a8-set-%e6%93%8d%e4%bd%9c%e9%9b%86%e5%90%88-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/311619.html","title":{"rendered":"JavaScript \u4e2d\u600e\u4e48\u5229\u7528 Set \u64cd\u4f5c\u96c6\u5408"},"content":{"rendered":"

\"JavaScript<\/p>\n

\u5728JavaScript\u4e2d\uff0cSet\u5bf9\u8c61\u5141\u8bb8\u4f60\u5b58\u50a8\u552f\u4e00\u503c\u7684\u96c6\u5408\u3002\u4e0d\u8bba\u662f\u539f\u59cb\u503c\u8fd8\u662f\u5bf9\u8c61\u5f15\u7528\uff0c\u8fd9\u4e9b\u503c\u5728Set\u4e2d\u603b\u662f\u552f\u4e00\u7684\u3002\u5f53\u4f60\u9700\u8981\u53bb\u9664\u91cd\u590d\u5143\u7d20\u3001\u68c0\u67e5\u5143\u7d20\u662f\u5426\u5b58\u5728\u3001\u6216\u6267\u884c\u6570\u5b66\u96c6\u5408\u64cd\u4f5c\u5982\u5e76\u96c6\u3001\u4ea4\u96c6\u3001\u5dee\u96c6\u65f6\uff0cSet\u5c31\u663e\u5f97\u975e\u5e38\u6709\u7528\u3002\u6838\u5fc3\u7684Set\u64cd\u4f5c\u5305\u62ec\uff1a\u521b\u5efaSet\u3001\u6dfb\u52a0\u6216\u5220\u9664\u5143\u7d20\u3001\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728Set\u4e2d\u3001\u83b7\u53d6Set\u7684\u5927\u5c0f\u3001\u4ee5\u53ca\u8fdb\u884c\u96c6\u5408\u95f4\u7684\u8fd0\u7b97<\/strong>\u3002\u5173\u4e8e\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u521b\u5efaSet\u662f\u57fa\u7840\u4e14\u6700\u91cd\u8981\u7684\u6b65\u9aa4\uff0c\u56e0\u4e3a\u6ca1\u6709Set\u5b9e\u4f8b\uff0c\u5176\u4ed6\u6240\u6709\u64cd\u4f5c\u90fd\u65e0\u4ece\u8c08\u8d77\u3002<\/p>\n<\/p>\n

Set\u7684\u521b\u5efa\u975e\u5e38\u76f4\u63a5\uff0c\u901a\u8fc7new\u5173\u952e\u5b57\u548cSet\u6784\u9020\u51fd\u6570\u5373\u53ef\u5b9e\u73b0\u3002\u4f60\u53ef\u4ee5\u5728\u521b\u5efa\u65f6\u76f4\u63a5\u63d0\u4f9b\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u4f8b\u5982\u6570\u7ec4\uff09\uff0cSet\u4f1a\u81ea\u52a8\u63d0\u53d6\u5176\u4e2d\u7684\u552f\u4e00\u503c\u3002\u5982\u679c\u4e0d\u63d0\u4f9b\u4efb\u4f55\u53c2\u6570\uff0c\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684Set\u3002\u4e0b\u9762\u4f1a\u66f4\u7ec6\u81f4\u5730\u6df1\u5165\u8ba8\u8bbaSet\u7684\u64cd\u4f5c\u53ca\u5176\u5e94\u7528\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u521b\u5efaSET<\/h3>\n<\/p>\n

JavaScript\u4e2d\u7684Set\u5bf9\u8c61\u7c7b\u4f3c\u4e8e\u6570\u5b66\u4e2d\u7684\u96c6\u5408\u6982\u5ff5\u3002\u8981\u521b\u5efa\u4e00\u4e2aSet\uff0c\u4f60\u53ef\u4ee5\u7b80\u5355\u5730\u4f7f\u7528new Set()<\/code>\u8bed\u6cd5\u3002\u5982\u679c\u4f60\u5df2\u7ecf\u6709\u4e00\u4e2a\u6570\u7ec4\u6216\u8005\u662f\u4efb\u4f55\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u5e76\u5e0c\u671b\u8f6c\u6362\u6210\u4e00\u4e2a\u7531\u552f\u4e00\u5143\u7d20\u7ec4\u6210\u7684Set\uff0c\u4f60\u53ef\u4ee5\u5c06\u8be5\u6570\u7ec4\u6216\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u4f20\u7ed9Set\u7684\u6784\u9020\u5668\u3002<\/p>\n<\/p>\n

\/\/ \u521b\u5efa\u7a7aSet<\/p>\n
const mySet = new Set();<\/p>\n
\/\/ \u7528\u6570\u7ec4\u521d\u59cb\u5316Set<\/p>\n
const numbers = new Set([2, 3, 4, 5, 5, 2]);<\/p>\n
console.log(numbers); \/\/ \u8f93\u51fa: Set(4) {2, 3, 4, 5} \u81ea\u52a8\u53bb\u91cd<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5730\u53bb\u9664\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\uff0c\u6216\u8005\u521d\u59cb\u5316\u4e00\u4e2aSet\u96c6\u5408\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u6dfb\u52a0\u6216\u5220\u9664\u5143\u7d20<\/h3>\n<\/p>\n
\u6dfb\u52a0\u5143\u7d20<\/h4>\n<\/p>\n
\u4f60\u53ef\u4ee5\u4f7f\u7528add<\/code>\u65b9\u6cd5\u5411Set\u4e2d\u6dfb\u52a0\u65b0\u7684\u5143\u7d20\u3002\u5982\u679c\u5c1d\u8bd5\u6dfb\u52a0\u4e00\u4e2a\u5df2\u5b58\u5728\u7684\u503c\uff0cSet\u4e0d\u4f1a\u62a5\u9519\uff0c\u4f46\u662f\u8be5\u503c\u4e0d\u4f1a\u88ab\u518d\u6b21\u6dfb\u52a0\u3002<\/p>\n<\/p>\n
const fruits = new Set();<\/p>\n
fruits.add("apple");<\/p>\n
fruits.add("banana");<\/p>\n
fruits.add("apple");  \/\/ \u91cd\u590d\u503c\uff0c\u4e0d\u4f1a\u88ab\u6dfb\u52a0\u5230Set\u4e2d<\/p>\n
console.log(fruits); \/\/ \u8f93\u51fa: Set(2) {"apple", "banana"}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5220\u9664\u5143\u7d20<\/h4>\n<\/p>\n
\u4f7f\u7528delete<\/code>\u65b9\u6cd5\u53ef\u4ee5\u4eceSet\u4e2d\u5220\u9664\u5143\u7d20\uff0c\u5982\u679c\u5220\u9664\u6210\u529f\u8fd4\u56detrue<\/code>\uff0c\u82e5\u6ca1\u6709\u627e\u5230\u5143\u7d20\u5219\u8fd4\u56defalse<\/code>\u3002<\/p>\n<\/p>\n
fruits.delete("apple"); \/\/ true<\/p>\n
console.log(fruits); \/\/ \u8f93\u51fa: Set(1) {"banana"}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u5143\u7d20\u5b58\u5728\u6027\u68c0\u67e5\u548c\u96c6\u5408\u5927\u5c0f<\/h3>\n<\/p>\n
\u68c0\u67e5\u5143\u7d20\u662f\u5426\u5b58\u5728<\/h4>\n<\/p>\n
has<\/code>\u65b9\u6cd5\u7528\u4e8e\u68c0\u67e5\u7ed9\u5b9a\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8eSet\u4e2d\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u8868\u793a\u8be5\u5143\u7d20\u662f\u5426\u4e3aSet\u7684\u6210\u5458\u3002<\/p>\n<\/p>\n
console.log(fruits.has("banana")); \/\/ true<\/p>\n
console.log(fruits.has("apple")); \/\/ false<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u83b7\u53d6Set\u7684\u5927\u5c0f<\/h4>\n<\/p>\n
\u901a\u8fc7size<\/code>\u5c5e\u6027\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6Set\u7684\u5927\u5c0f\uff0c\u5373\u5176\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
console.log(fruits.size); \/\/ 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u96c6\u5408\u95f4\u7684\u8fd0\u7b97<\/h3>\n<\/p>\n
\u96c6\u5408\u95f4\u7684\u8fd0\u7b97\u5bf9\u4e8e\u6267\u884c\u6bd4\u5982\u67e5\u627e\u4e24\u4e2a\u96c6\u5408\u4e2d\u7684\u5171\u6709\u5143\u7d20\uff08\u4ea4\u96c6\uff09\u3001\u5408\u5e76\u4e24\u4e2a\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff08\u5e76\u96c6\uff09\u3001\u6216\u8005\u627e\u51fa\u4e00\u4e2a\u96c6\u5408\u4e2d\u6709\u800c\u53e6\u4e00\u4e2a\u96c6\u5408\u4e2d\u6ca1\u6709\u7684\u5143\u7d20\uff08\u5dee\u96c6\uff09\u800c\u8a00\uff0c\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
\u5e76\u96c6<\/h4>\n<\/p>\n
const setA = new Set([1, 2, 3]);<\/p>\n
const setB = new Set([4, 3, 2]);<\/p>\n
const union = new Set([...setA, ...setB]);<\/p>\n
console.log(union); \/\/ \u8f93\u51fa: Set(4) {1, 2, 3, 4}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4ea4\u96c6<\/h4>\n<\/p>\n
const intersection = new Set([...setA].filter(x => setB.has(x)));<\/p>\n
console.log(intersection); \/\/ \u8f93\u51fa: Set(2) {2, 3}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5dee\u96c6<\/h4>\n<\/p>\n
const difference = new Set([...setA].filter(x => !setB.has(x)));<\/p>\n
console.log(difference); \/\/ \u8f93\u51fa: Set(1) {1}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u7ed3\u8bba<\/h3>\n<\/p>\n
\u901a\u8fc7\u5b66\u4e60\u4ee5\u4e0a\u64cd\u4f5c\uff0c\u4f60\u73b0\u5728\u5e94\u8be5\u80fd\u591f\u719f\u7ec3\u5730\u4f7f\u7528JavaScript\u4e2d\u7684Set\u5bf9\u8c61\u6765\u5904\u7406\u96c6\u5408\u6570\u636e\u4e86\u3002\u65e0\u8bba\u662f\u53bb\u9664\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\uff0c\u8fd8\u662f\u8fdb\u884c\u590d\u6742\u7684\u96c6\u5408\u8fd0\u7b97\uff0cSet\u90fd\u662f\u4e00\u4e2a\u975e\u5e38\u5f3a\u5927\u4e14\u6613\u4e8e\u4f7f\u7528\u7684\u5de5\u5177\u3002\u6b63\u662f\u7531\u4e8e\u5176\u7b80\u5355\u7684API\u548c\u9ad8\u6548\u7684\u6027\u80fd\uff0c\u4f7f\u5f97Set\u6210\u4e3a\u4e86\u5904\u7406\u96c6\u5408\u6570\u636e\u7684\u9996\u9009\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528 Set \u6765\u64cd\u4f5c\u96c6\u5408\uff1f<\/strong><\/p>\n
Set \u662f JavaScript \u7684\u4e00\u79cd\u5185\u7f6e\u5bf9\u8c61\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u65e0\u5e8f\u4e14\u552f\u4e00\u7684\u6570\u636e\u7ed3\u6784\uff0c\u975e\u5e38\u9002\u5408\u7528\u6765\u64cd\u4f5c\u96c6\u5408\u3002\u4f7f\u7528 Set \u53ef\u4ee5\u8f7b\u677e\u5730\u53bb\u9664\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\uff0c\u5e76\u4e14\u53ef\u4ee5\u5bf9\u96c6\u5408\u8fdb\u884c\u4ea4\u3001\u5e76\u3001\u5dee\u7b49\u64cd\u4f5c\uff0c\u975e\u5e38\u65b9\u4fbf\u5b9e\u7528\u3002<\/p>\n
2. \u5982\u4f55\u521b\u5efa\u4e00\u4e2a Set\uff1f<\/strong><\/p>\n
\u8981\u521b\u5efa\u4e00\u4e2a Set\uff0c\u53ef\u4ee5\u4f7f\u7528 Set \u6784\u9020\u51fd\u6570\uff0c\u5e76\u4f20\u5165\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u5982\u6570\u7ec4\uff09\u4f5c\u4e3a\u53c2\u6570\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u4e0d\u91cd\u590d\u5143\u7d20\u7684 Set\uff1a<\/p>\n
const mySet = new Set([1, 2, 3, 3, 4, 5]);\nconsole.log(mySet); \/\/ \u8f93\u51fa\uff1aSet { 1, 2, 3, 4, 5 }\n<\/code><\/pre>\n
3. Set \u652f\u6301\u54ea\u4e9b\u5e38\u7528\u65b9\u6cd5\u6765\u64cd\u4f5c\u96c6\u5408\uff1f<\/strong><\/p>\n
Set \u63d0\u4f9b\u4e86\u4e00\u4e9b\u5e38\u7528\u65b9\u6cd5\u6765\u64cd\u4f5c\u96c6\u5408\uff0c\u5305\u62ec\uff1a<\/p>\n
    \n
  • add(value)\uff1a\u5411\u96c6\u5408\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\u3002<\/li>\n
  • delete(value)\uff1a\u4ece\u96c6\u5408\u4e2d\u5220\u9664\u6307\u5b9a\u5143\u7d20\u3002<\/li>\n
  • has(value)\uff1a\u5224\u65ad\u96c6\u5408\u4e2d\u662f\u5426\u5b58\u5728\u6307\u5b9a\u5143\u7d20\u3002<\/li>\n
  • clear()\uff1a\u6e05\u7a7a\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002<\/li>\n
  • size\uff1a\u83b7\u53d6\u96c6\u5408\u7684\u5927\u5c0f\uff08\u5143\u7d20\u6570\u91cf\uff09\u3002<\/li>\n
  • forEach(callback)\uff1a\u904d\u5386\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5bf9\u5176\u6267\u884c\u6307\u5b9a\u7684\u56de\u8c03\u51fd\u6570\u3002<\/li>\n<\/ul>\n
    \u901a\u8fc7\u8fd0\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u5bf9 Set \u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\uff0c\u4f8b\u5982\u6dfb\u52a0\u5143\u7d20\u3001\u5220\u9664\u5143\u7d20\u3001\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728\u7b49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728JavaScript\u4e2d\uff0cSet\u5bf9\u8c61\u5141\u8bb8\u4f60\u5b58\u50a8\u552f\u4e00\u503c\u7684\u96c6\u5408\u3002\u4e0d\u8bba\u662f\u539f\u59cb\u503c\u8fd8\u662f\u5bf9\u8c61\u5f15\u7528\uff0c\u8fd9\u4e9b\u503c\u5728Set\u4e2d\u603b\u662f\u552f\u4e00 […]","protected":false},"author":3,"featured_media":311633,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/311619"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=311619"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/311619\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/311633"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=311619"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=311619"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=311619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}